SsangYong Stavic / SsangYong Rodius (2005 year). Service manual — part 307
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Self diagnostic 11
Selector lever unit
Instrument panel
CAN (Controller Area Network )
Function
Circuit diagram
CAN input signal
CAN output signal
TCU
Accelerator pedal position
Wheel speed (all wheels)
Engine rpm, Engine torque
Coolant temperature
Downshift
Speed control (constant)
Meshed gear
2nd gear start up control
Selected gear in transfer case
Selector lever position
Odometer (I/P)
Selected gear
Shifted status
Lock-up clutch status
Automatic transmission
Kick-down status
Driving conditions
Engine torque control
Dangerous status (changes to
emergency mode when
overloading, dangerous conditions,
and internal fault exists)
ATF Temperature
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Function
TCU controls the gear groups according to the driving conditions. It receives the driving data from many sensors and
switches as input signals. It is also connected with ECU, HECU, instrument panel and selector lever control unit.
1. Shifting Method
Basic shift operation includes up-shift and down-shift for all gear groups. Shift control unit determines driving
resistance, accelerator pedal position, vehicle speed and some parameters (road surface condition, up hill and
down hill gradients, trailer driving conditions, catalytic converter conditions, driving habits and automatic transmission
oil temperature) to select a shift gear.
2. Down Shift
When engine speed increases excessively, the down shift does not occur.
3. Engine RPM Adjustment
During shifting, the engine torque is reduced to optimize the shift operation by delaying the ignition time.
4. Lock-Up Clutch Control
The lockup clutch in torque converter is activated in 3rd, 4th and 5th gear and operates in sequence via PWM
solenoid valve.
5. Others
The transmission is automatically controlled to compensate durability and wear.
The shift control values such as shifting point, shifting time, pressure during shifting, and lockup clutch control are
permanently saved and the diagnosis is partially available.
TCU (Transmission Control Unit)
TCCU
TCU
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TCU block diagram
Engine
control
Engine torque
Max. Engine torque
Engine power loss
Engine rpm
ACC pedal position
Engine torque
reduction
Engine control status
HECU
Wheel speed (FR, FL)
Wheel speed (RR, RL)
Shift pattern changes
Driving force control
Selector
angle
Posi. Identifi. signal WO
Posi. Identifi. signal W1
Posi. Identifi. signal W2
Posi. Identifi. signal W3
W/S mode signal input
I/P
Selector lever indication
Part-
time
TOD
TCCU
Selected T/C gear
Sol.
valve
M/P S/V
S/P S/V
Power supply (valves)
1-2/4-5 gears S/V
3-4 gears S/V
2-3 gears S/V
Sensor
Sensor power supply
Sensor fround
Starter
relay
Start signal
T/M
Diag.
Conn.
Lockup clutch S/V
N3 speed
Shift pattern changes
Driving force controls
N2 speed
Diagnosis
IGN1
P/N starting recognition
TCU (EGS) power
Power
ground
TCU (EGS) ground
T
C
U
C
A
N
D
I
G
I
T
A
L
36
37
38
14
15
16
17
13
33
7
12
35
1
29
25, 27
30
Mileage
W/S mode indication
Shift pattern changes
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DC 5-SPEED AUTOMATIC TRANSMISSION
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4A
Characteristics of TCU and Automatic Transmission (LHM: Limp-Home
Mode)
The emergency driving mode is to minimize vehicle’s operation when is a mode for maintaining minimum driving condi-
tion when the automatic transmission is defective. In emergency driving mode, excessively long driving and unreason-
able driving should be avoided to prevent bigger fault occurring in advance. Emergency driving mode can largely be
divided in electrical defective and hydraulic pressure/mechanical defective.
Electrical defect
• If an electrical defective occurs in transmission during driving, current shift gear position is held.
A. Shut off of various solenoid valves
B. Internal pressure in transmission increases (shift shock gets bigger when changing selector lever due to
maximized MP and SP)
C. Lockup clutch is released
• If the shift operation cannot be activated, the driver must reset the system as follows:
A. Stop the vehicle and place the selector lever to “P” position.
B. Wait for 10 seconds after stopping the engine (release hydraulic pressure)
C. Start the engine.
D. Place the selector lever to “D” or “R” position.
Mechanical/hydraulic pressure defect
• Characteristics that appears in the vehicle are as below:
A. Holds at 3rd gear (It can be held at proper gear if the fault occurs at 3rd gear)
B. Electrical devices operate normally and the shift shock is acceptable during shift operation.
• If the shift operation cannot be activated, the driver must reset the system as follows:
A. Stop the vehicle.
B. Put the selector lever in “P” or “N” position.
C. Stop the engine.
D. In most cases, it is reset when the engine is started and the vehicle operate normally.
If, however, hydraulic or mechanical problem is not cleared, shifting is hold in 3rd or most stable gear range.
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